/in/foo.c:1:1: warning: return type defaults to 'int' [-Wimplicit-int]
 main(n){gets(&n);putchar(n%85+5);}
 ^~~~
/in/foo.c: In function 'main':
/in/foo.c:1:1: warning: type of 'n' defaults to 'int' [-Wimplicit-int]
/in/foo.c:1:9: warning: implicit declaration of function 'gets' [-Wimplicit-function-declaration]
 main(n){gets(&n);putchar(n%85+5);}
         ^~~~
/in/foo.c:1:18: warning: implicit declaration of function 'putchar' [-Wimplicit-function-declaration]
 main(n){gets(&n);putchar(n%85+5);}
                  ^~~~~~~
/tmp/cc0BBFgS.o: In function `main':
foo.c:(.text.startup+0x10): warning: the `gets' function is dangerous and should not be used.